Abstract
Two grossly similar neoplasms of the stomach were studied with the light and electron microscope. They were diagnosed as well-differentiated leiomyosarcoma and leiomyoblastoma, respectively. The leiomyosarcoma cells contained scanty myofibrils as compared with normal smooth muscle but exhibited a striking number of mitochondria. The cells of the leiomyoblastoma exhibited more myofibrils, and its vacuolar nature was confirmed. Some of the vacuoles appeared to represent degeneration of mitochondria, others were clearly derived from rough-surfaced endoplasmic reticulum, and still others might well represent light cells among darker elements.

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